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If you do indeed have a torque down low engine, matching your existing gear ratio in first is unnecessary and may make you slower. I launched my old 1991 K2500LD with the 5.7 in first, because it was a bit faster. I launch my heavier 1994 K2500 with the 6.5 in second, because it is faster than launching in first. The same transmission (8.63 spread ratio) in both, with the most major difference being the torque curves, the latter having torque down low.
I don't know how you could pick your gearing or cruise RPM until you have at least a torque curve for the motor you will be using. Without doing what the other suggest, you will have a narrow window where this will work well.
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